What tool is commonly used to measure air pressure in an air compressor?

In an air compressor, a pressure gauge is the instrument specifically designed to measure air pressure. It provides a clear and accurate reading of the pressure within the compressor system, which is essential for monitoring performance and ensuring safe operation. Pressure gauges typically display the pressure in units like psi (pounds per square inch), allowing operators to easily assess whether the compressor is functioning within its specified pressure range.

Understanding air pressure is critical for optimizing the compressor's performance, as operating outside of the recommended pressure levels can lead to inefficiency or damage. Unlike other tools mentioned, such as a torque wrench or a multimeter, which serve different functions in measuring mechanical resistance or electrical parameters respectively, a pressure gauge is solely focused on air pressure measurement, making it the appropriate tool for this purpose. Additionally, a flow meter measures the rate of airflow, which is not the same as measuring pressure, further emphasizing the distinct role of the pressure gauge in compressor operation.